Marie Curie

Greer Garson

Acting

Pierre Curie

Walter Pidgeon

Acting

Eugene Curie

Henry Travers

Acting

Professor Jean Perot

Albert Bassermann

Acting

David Le Gros

Robert Walker

Acting

Lord Kelvin

C. Aubrey Smith

Acting

Madame Eugene Curie

May Whitty

Acting

President of University

Victor Francen

Acting

Madame Perot

Elsa Bassermann

Acting

Dr. Becquerel

Reginald Owen

Acting

Reporter

Van Johnson

Acting

Irene Curie - Age 5

Margaret O'Brien

Acting

Narration Spoken By (voice)

James Hilton

Writing

Tall Woman (uncredited)

Mariska Aldrich

Acting

Man at Accident (uncredited)

Tony Carson

Acting

Swedish Queen (uncredited)

Ruth Cherrington

Acting

Lecturer (voice) (uncredited)

Ray Collins

Acting

Professor (uncredited)

Guy D'Ennery

Acting

Cart Driver (uncredited)

George Davis

Acting

Professor (uncredited)

Harold De Becker

Acting

Assistant Tailor (uncredited)

Franz Dorfler

Acting

Woman at Accident (uncredited)

Justine Duney

Acting

Man at Accident (uncredited)

Tay Dunn

Acting

Cart Driver (uncredited)

William Edmunds

Acting

Board Member (uncredited)

Nestor Eristoff

Acting

Man at Accident (uncredited)

Al Ferguson

Acting

Board Member (uncredited)

Edward Fielding

Acting

Prof. Constant (voice) (uncredited)

Howard Freeman

Acting

Perot Granddaughter (uncredited)

Linda Lee Gates

Acting

Perot Granddaughter (uncredited)

Marie Louise Gates

Acting

Lucille (uncredited)

Lisa Golm

Acting

Seamstress (uncredited)

Ilka Grüning

Acting

Professor Roget (uncredited)

Lumsden Hare

Acting

Son (uncredited)

Teddy Infuhr

Acting

Board Member (uncredited)

James Kirkwood

Acting

Woman at Accident (uncredited)

Isabel La Mal

Acting

Bit Part (uncredited)

Gene Lockhart

Acting

Businessman (uncredited)

Miles Mander

Acting

Singing Professor (uncredited)

George Meader

Acting

Master Michaud (uncredited)

Dickie Meyers

Acting

Wedding Guest (uncredited)

Noel Mills

Acting

Photographer (uncredited)

Leo Mostovoy

Acting

Dr. Bladh (uncredited)

Alan Napier

Acting

President of Businessman's Board (uncredited)

Moroni Olsen

Acting

Woman at Accident (uncredited)

María Pagés

Acting

Eve at 18 Months (uncredited)

Gigi Perreau

Acting

Monsieur Michaud (uncredited)

Francis Pierlot

Acting

Woman at Accident (uncredited)

Nita Pike

Acting

Nurse (uncredited)

Dorothy Raye

Acting

Madame Michaud (uncredited)

Almira Sessions

Acting

Businessman (uncredited)

Arthur Shields

Acting

King Oscar (uncredited)

Wyndham Standing

Acting

Driver (uncredited)

Ray Teal

Acting

Board Member (uncredited)

Charles Trowbridge

Acting

Proud Papa (uncredited)

Michael Visaroff

Acting

Jewelry Salesman (uncredited)

Marek Windheim

Acting

Businessman (uncredited)

Frederick Worlock

Acting

Doctor (uncredited)

Eustace Wyatt

Acting